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I have a pair of Ochrestriped Cardinalfish that hang in the top and middle for most of the time. If I ever run across some Yellow Stripe Cardinalfish I'll pick up a pair of them too.
A tank that size limits what will thrive in it. Blue Green Reef Chromis is a candidate or others in that family. This site is my go to when I'm looking to add a critter to my system. http://www.liveaquaria.com
Lots of good info!
Good luck!